sirjamesdeverajr - Activities/Worksheets

SCIENTIFIC METHOD

Activity 1

PROBLEM: How is a scientific method used to solve problems?

Materials

2 glass containers 2 paper towels 1/2 cup salt pentel pen

40 mongo seeds 2 self-sealing plastic masking tape

Procedure

Solve this problem using a scientific method: Do seeds grow better when soaked in plain water or salt water?
Research the problem. Find out what seeds need in order to grow.
Develop a hypothesis based on the problem.
Conduct the experiment.
1. Copy the data table.
2. Label the two jars A and B. fill each beaker with 50 mL of water.
3. Add 20 mongo seeds to jar A. Add 20 mongo seeds and ½ cup salt to beaker B. Label each beaker as control or experimental variable and set them overnight.
4. On the following day, pour out the water from both beakers.
5. Wrap the seeds from beaker A with a damp paper towel. Place the paper towel into a plastic bag and close the bag with a masking tape. Label the bag A.
6. Repeat step e with the seeds in beaker B.

	SEEDS USED	SEEDS THAT GREW
Water
Salt water

Collect the data.
1. On the next day check the seeds for growth. Look for small white roots.
2. Count the number of seeds that are growing in each bag. Record these numbers in your data table.
Draw conclusions. Based on your data, decide if you need a new hypothesis.

Data and Observations

1. Under what condition, plain water or salt water, did more seeds grow?

2. Under what condition, plain water or salt water, did fewer seeds grow?

Analysis and Apply

Check your hypothesis: Is your original hypothesis supported by your data? Why or why not?
Infer: How can you be sure that the conclusion you reached is correct?
What variable was being tested in this experiment? What was the control?
Apply: How do salt water and plain water affect seed growth?

WORKSHEET 1

DIRECTIONAL TERMS AND BODY PLANES

I. Match the terms in the key to the relationships listed in questions 1-10 by writing the correct directional term in the space provided.

Key:

a. anterior b. posterior c. superior d. inferior e. medial

f. lateral g. proximal h. distal i. superficial j. deep

k. central l. peripheral

1. the TRACHEA in relation to the ESOPHAGUS ______________

2. the HEART in relation to the RIB CAGE ______________

3. the FACE in relation to the NECK ______________

4. the BRIDGE OF THE NOSE in relation to the EYES ______________

5. the ELBOW in relation to the HANDS ______________

6. the HAND in relation to the ELBOW ______________

7. the STOMACH in relation to the LIVER ______________

8. the SKIN in relation to the MUSCLES ______________

9. the EYES in relation to the NOSE ______________

10. the HEART in relation to the LUNGS ______________

II. Identify the body planes below and describe each.

WORKSHEET 2

CELL STRUCTURE AND FUNCTION

1. What are the three main parts of any human cell? Describe each.

2. Describe the structure and function of ribosomes.

3. What is the endomembrane system? What organelles belong to this system?

4. Describe the structure and function of endoplasmic reticulum (ER). Include the terms smooth ER, rough

ER, and ribosomes in your description.

5. Describe the structure and function of the Golgi apparatus. Mention vesicles and lysosomes in your description.

6. Describe the structure and function of mitochondria. Mention the energy molecule ATP in your description.

7. What is the cytoskeleton, and what role does the cytoskeleton play in cells?

MICROSCOPY
Acitvity 2

Objectives:

Prepare a wet mount slide.

Compare the observations made under HPO and LPO.

Materials

compound microscope
microscope slide
cover slip
scissors
dropper
forceps
small piece of newspaper print

Procedure:

Place a drop of water in the center of the glass slide.
With forceps, place a small piece of newspaper print in the drop of water. Make sure the piece of newspaper has letter “e” in it.
Hold a clean coverslip by the edges at one side of the drop of water. Carefully lower the coverslip onto the drop of water. You have just made a wet mount slide.
Place the slide on the stage of the microscope. Put the stage clips into place. Move the slide so that the newspaper print is directly over the hole in the stage.
Turn the low-power objective into place.
Looking from the side, turn the coarse adjustment so that the low-power objective is near the coverslip.
Open the diaphragm so that the most light enters the microscope. If your microscope has a mirror, adjust it until you see a circle of light. This circle of light is called the field of view.
Look through the eyepiece. Try to keep both eyes open. Raise the body tube until you can see the letters. CAUTION: Never lower the body tube while looking through the eyepiece.
Use the fine adjustment to bring the letters into sharp focus. Find a letter “e”.
Adjust the slide so that the letter “e” is in the center of your field of view.
On the space provide below, make a drawing of the letter “e”.
Recognize spatial relationships: Move the slide to the left, to the right, toward you and away from you. Note the direction in which the “e” appears to move.
Turn the nosepiece to bring the high-power objective into position. Focus with the fine adjustment. CAUTION: use only the fine adjustment with the high-power objective.
Draw the letter “e” as it appears under high power.
Remove the wet mount. Rinse and dry the slide and coverslip.

Data and Observations

What happens when move the slide to the left? To the right? Toward you? Away from you?
Describe the appearance of the letter “e” under high power.

Analyze and Apply

What is the purpose of the coverslip?
Why should the coverslip be held by the edges?
Apply: why must a specimen be very thin to be viewed under the microscope?

Extension

Observe: Get a drop of pond water and view some protists under the microscope.